diff --git a/src/Shell.c b/src/Shell.c
index fcf10a5..67e24bf 100644
--- a/src/Shell.c
+++ b/src/Shell.c
@@ -90,6 +90,9 @@ in this Software without prior written authorization from The Open Group.
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef _WIN32
+#include <process.h>
+#endif // _WIN32
 
 #ifdef EDITRES
 #include <X11/Xmu/Editres.h>